One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,13)(12,14)(15,16)(17,18,20,22)(19,25,26,32)(21,29,28,24)(23,31,30,27)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(18,22)(23,30)(24,29)(25,32) involution — undirected(10,14)(11,15)(17,19,21,27,20,26,28,31)(18,23,24,25,22,30,29,32)(11,15)(13,16)(19,26)(23,30)(25,32)(27,31) involution — undirected(1,3,4,7)(2,6,5,8)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.